An iterative methods such as Algebraic Reconstruction Technique (ART) and analytical Fourier methods such as Filtered Back projection
(FBP) have been considered by several applications.
SIRT alternates forward and back projections
. Its update equation is:
technique redistributes the number of counts at each particular point back along a line from which they were originally detected.
Then, the tomographic processing called back projection
is presented to get SAR image by combining the backscattering data calculated by using PILE + FB.
In the traditional signal processing methods [5-10], the information of the ground surface is treated as clutters or noise to be canceled, for example, the optimal time-domain detection , the iterative frequency-domain clutter reduction , hidden Markov models for target classification , the ultrawide-band synthetic aperture radar (SAR) processing [8,9] and traditional Back Projection
(BP) method , etc.
Musion, the company that has installed these back projection
systems at Manchester Airport, calls them 'holograms'.
A key requirement of the filtered back projection
reconstruction algorithm typically used by CT is for the set of 2-D images to represent a full 360[degrees] rotation of the object relative to the source and detector.
n In the space of four evenings, I saw Bromsgrove Operatic Society (Carousel) and The Nonentities, of Kidderminster (Ladies Down Under), using back projection
instead of cumbersome sets.
When Anne arrives, she is seen driving against a back-projection of London streets, but with back projection
used throughout, the inference is obscure.
Using a video back projection
, scene changes were achieved with speed and some fun, familiar scenes arriving on the back wall while props were pushed in from the wings.
, used to make it look as if cars were actually moving, often got stuck and Colin Welland remembered having to step nonchalantly from a car that was apparently travelling at 60mph.
It is composed of three walls of structured plastic sheeting illuminated from behind, and a multi-media wall for back projection